Rip1

Chapter 25

Routing Information Protocol (RIP)

Introduction ................................................................................................. 25-2
Configuring RIP ........................................................................................... 25-3
Redistributing Routes into RIP ...................................................................... 25-4
Statically-Configured Routes .................................................................. 25-4
BGP Routes ........................................................................................... 25-4
Configuration Example ................................................................................ 25-5
Command Reference ................................................................................... 25-7
add ip rip interface ................................................................................ 25-7
add ip rip redistribute .......................................................................... 25-10
add ip trusted ...................................................................................... 25-11
delete ip rip interface .......................................................................... 25-12
delete ip rip redistribute ...................................................................... 25-14
delete ip trusted .................................................................................. 25-14
set ip rip interface ............................................................................... 25-15
set ip rip redistribute ........................................................................... 25-18
set ip riptimer ...................................................................................... 25-19
show ip rip .......................................................................................... 25-20
show ip rip counter ............................................................................. 25-22
show ip rip redistribute ........................................................................ 25-24
show ip riptimer .................................................................................. 25-25
show ip trusted ................................................................................... 25-26

25-2 AR400 Series Router Software Reference

Introduction
Routing Information Protocol (RIP) is a simple distance vector routing
protocol. It enables the router to learn routes to other networks. The following
RFCs describe RIP:
■ RFC 1058, Routing Information Protocol
■ RFC 1723, RIP Version 2—Carrying Additional Information
■ RFC 1582, Extensions to RIP to Support Demand Circuits

Route selection RIP determines the number of hops between the destination and the router,
where one hop is one link. This hop count is referred to as the RIP metric.
Given a choice of routes, RIP uses the route with the lowest metric, and
therefore the route that takes the lowest number of hops. If multiple routes
have the same metric, RIP chooses the first route it finds.

RIP is limited to routes of 15 hops or less. If a network is more than 15 hops
away, RIP does not put its route into the router’s routing table.

RIP suits star topologies very well. It is less suited to a meshed (multiply
connected) network, because in meshed networks it learns multiple copies of
routes, with different metrics.

Neighbours To maintain its table of RIP routes, the router periodically receives broadcasts of
routing information from neighbouring routers, called RIP neighbours. Similarly,
the router periodically broadcasts its routing information to its neighbours. The
router removes routes from the table if the neighbouring routers do not keep
them up to date (refresh them).

Each router interface’s RIP neighbours must be in the same subnet as the
interface. For security reasons, the router only accepts RIP broadcasts from
addresses in its subnet.

RIPv2 RFC 1723 describes RIP version 2, which enables RIP updates to contain subnet
masks and next hop information. The ability to carry subnet masks means
different subnets within the same network can use different sized subnet
masks.

RIP on demand RFC 1582 extends RIP so that you can use it over dial-on-demand connections,
which are activated when there is traffic to send. The two ends of the link
exchange route information when their routing tables change. The routes do
not age out, so RIP on demand does not need to exchange frequent messages to
keep routes alive.

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Routing Information Protocol (RIP) 25-3

Configuring RIP

Neighbours You do not have to enable RIP. RIP automatically exchanges routing
information with each neighbour when you specify the interface over which it
accesses that neighbour. To do this, use the command:
add ip rip interface=interface [other-options...]

To remove RIP neighbours, use the command:
delete ip rip interface=interface [other-options...]

If you delete all RIP neighbours, this also disables RIP broadcasts.

To modify the settings of a RIP neighbour, use the command:
set ip rip interface=interface [other-options...]

RIP on demand When you configure RIP over a dial-on-demand connection, use the command:
add ip rip interface=interface demand=yes [other-options...]

Assigning metrics You can assign specific RIP metrics to statically-defined routes, by using one of
the commands:
add ip route=ipadd interface=interface nexthop=ipadd
metric1=1..16 [other-options...]
set ip route=ipadd interface=interface nexthop=ipadd
metric1=1..16 [other-options...]

Displaying To display the neighbours to which the router is sending RIP broadcasts, use
information the command:
show ip rip [other-options...]

RIP propagates interface routes as long as their status at a physical level is up.
For VLANs, this means that RIP propagates the VLAN’s interface route when
at least one port in the VLAN is active. You can check which interfaces are
down by using either of the following commands:
show ip interface
show ip route [other-options...]

In both of the above commands, a hash symbol (#) next to the interface name
indicates that the interface is down.

Timers The operation of RIP is controlled by four global timers. To set the value of
these timers, use the command:
set ip riptimer [flush=1..4294967295]
[holddown=1..4294967295] [invalid=1..4294967295]
[update=1..4294967295]

If you change a timer, existing routes are not affected, only new routes.

To display current values of the RIP timers, use the command:
show ip riptimer

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Redistributing Routes into RIP
You can redistribute routes from the following sources as RIP routes:
■ Statically-Configured Routes
■ BGP Routes

Statically-Configured Routes
By default, RIP imports statically-configured routes into the RIP routing table
and advertises them to RIP neighbours. To avoid advertising statically-
configured routes over an interface, use one of the commands:
add ip rip interface=interface staticexport=no
[other-options...]
set ip rip interface=interface staticexport=no
[other-options...]

To start advertising statically-configured routes again, use the command:
set ip rip interface=interface staticexport=yes
[other-options...]

BGP Routes
You can configure RIP to redistribute up to 500 BGP routes as RIP routes, by
using the command:
add ip rip redistribute protocol=bgp [other-options...]

You can also set the RIP metric for the imported routes, choose whether to
import subnet routes, specify the number of routes to import, and filter routes
through a route map.

To change the settings for redistributing routes, use the command:
set ip rip redistribute protocol=bgp [other-options...]

To display the settings for redistributing BGP routes, and the number of BGP
routes that RIP is currently redistributing, use the command:
show ip rip redistribute

The number of routes that RIP can redistribute is limited because RIP is not
designed to process large numbers of routes. By default, the limit is set to 50.
When the limit is reached, routes are no longer imported until existing routes
are removed. Because they are BGP routes, BGP controls when the routes
disappear. To ensure RIP imports the routes it needs to, we recommend you:
■ minimise the number of routes in the BGP route table by configuring
automatic summarising
■ use a route map to select an appropriate subset of the BGP routes

For information about route maps and filtering, see Chapter 28, Filtering IP
Routes.

To stop RIP from redistributing BGP routes, use the command:
delete ip rip redistribute protocol=bgp

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Routing Information Protocol (RIP) 25-5

Configuration Example
The following example shows how to configure RIP on a LAN.

You can find another example that uses RIP in “Basic IP Setup over PPP” on
page 22-50 of Chapter 22, Internet Protocol (IP).

In this example (Figure 25-1):
■ Router A receives OSPF routes from a Metropolitan Area Network. RIP
transfers these routes to routers and switches on the LAN.
■ Router B is on the same LAN as router A.
■ An ADSL modem connects a remote office to router B, through switch port
2 on vlan2. The remote office is on a different subnet from router A. RIP
enables routing between the remote office and the LAN.

The configuration is shown in:
■ Figure 25-1—a diagram of the scenario
■ Figure 25-2 on page 25-6—the commands to configure Router A
■ Figure 25-3 on page 25-6—the commands to configure Router B

Figure 25-1: Example configuration for RIP

metropolitan
area network

OSPF

Router A

vlan1: 192.168.100.1
RIP
LAN
RIP
vlan1: 192.168.100.2

Router B

vlan2: 192.168.200.1

ADSL
modem remote office
ADSL
rip-eg

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Figure 25-2: Example script for configuring RIP on Router A

# Configuring RIP on Router A

# enable IP routing
enable ip

# give vlan1 an IP address
add ip int=vlan1 ip=192.168.100.1 mask=255.255.255.0

# configure RIP over vlan1
add ip rip int=vlan1 send=rip2 receive=rip2

Figure 25-3: Example script for configuring RIP on Router B

# Configuring RIP on Router B

# enable IP routing
enable ip

# give vlan1 an IP address

# create vlan2, assign a port to it, and give it an IP address
create vlan=vlan2 vid=2
add vlan=2 port=2

# configure RIP over vlan1 and vlan2

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Routing Information Protocol (RIP) add ip rip interface 25-7

Command Reference
This section describes the commands available on the router to configure and
manage RIP.

Some interface and port types mentioned in this chapter may not be supported
on your router. The interface and port types that are available vary depending
on your product's model, and whether an expansion unit (PIC) is installed. For
more information, see the Hardware Reference for the router.

The shortest valid command is denoted by capital letters in the Syntax section.
See “Conventions” on page lxii of About this Software Reference in the front of
this manual for details of the conventions used to describe command syntax.
See Appendix A, Messages for a complete list of error messages and their
meanings.

add ip rip interface

Syntax ADD IP RIP INTerface=interface [CIRCuit=miox-circuit]
[DLCi=dlci] [IP=ipadd] [NEXThop=ipadd] [SENd={NOne|
RIP1|RIP2|COmpatible}] [RECeive={NOne|RIP1|RIP2|BOth}]
[DEMand={False|NO|OFF|ON|True|YES}] [AUth={NOne|
PASSword|MD5}] [PASSword=password] [STATicexport={YES|
NO}]

where:
■ interface is an interface name formed by concatenating a Layer 2 interface
type, an interface instance, and optionally a hyphen followed by a logical
interface number from 0 to 15. If a logical interface is not specified, 0 is
assumed.
■ miox-circuit is the name of a MIOX circuit defined for an X.25 interface 1 to
15 characters long. The name is not case-sensitive.
■ dlci is the Data Link Connection Identifier (DLCI) of a Frame Relay DLC
(circuit) from 0 to 1023.
■ ipadd is an IP address in dotted decimal notation.
■ password is a string 1 to 63 characters long. It may contain uppercase and
lowercase letters, digits (0-9), and the hyphen and underscore characters.

Description This command configures an interface for RIP. The router exchanges routing
information with one or more neighbours via that interface.

The interface parameter specifies an existing interface on which to send or
receive RIP packets. Valid interfaces are:
■ eth (such as eth0, eth0-1)
■ ATM (such as atm0.1)
■ PPP (such as ppp0, ppp1-1)
■ FR (such as fr0, fr0-1)

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25-8 add ip rip interface AR400 Series Router Software Reference

■ X.25 DTE (such as x25t0, x25t0-1)
■ VLAN (such as vlan1, vlan1-1)

To see a list of currently-available interfaces, use the show interface command
on page 9-68 of Chapter 9, Interfaces.

The circuit parameter specifies the X.25 circuit on which the router sends or
receives RIP packets. It is a required parameter for X25T interfaces and is only
valid for X25T interfaces.

The dlci parameter specifies the Frame Relay DLCI on which to send or receive
RIP packets. It is a required parameter for Frame Relay interfaces and is only
valid for Frame Relay interfaces.

The ip parameter specifies the IP address of the RIP neighbour. The following
table shows the difference between specifying an address and not specifying an
address.

If you... The router accepts... And sends RIP updates to...
specify an address RIP packets from that that address.
by using ip address on this interface
do not specify ip all RIP packets on this • the RIP multicast address
interface 224.0.0.9 if the send parameter is
rip2 or compatible.
• the broadcast address if the send
parameter is rip1.

The nexthop parameter specifies the IP address of the best next hop to the
destination. In most configurations, the router is the best next hop when it is
the originator of the RIP update. In that case, specify nexthop=0.0.0.0.
However, in some configurations, the best route to the destination is out
another router. In that case, specify the IP address of that router as the next
hop. This stops RIP neighbours from unnecessarily sending packets via the
router. See Appendix A of RFC 1723 for an example in which part of a network
uses RIP and part uses another routing protocol such as OSPF. The nexthop
parameter is only valid when you specify ip and when send is rip2 or
compatible. The default next hop is 0.0.0.0.

The send parameter specifies the version of RIP packet to send. If you specify
none, then the router does not send RIP packets. If you specify rip1, then the
router sends RIPv1 packets. If you specify rip2, then the router sends RIPv2
packets. If you specify compatible, then the router sends RIPv2 packets that
are compatible with routers that only receive RIPv1 packets. It achieves
compatibility by excluding routes that such routers treat as host routes. The
default is rip1.

The receive parameter specifies the version of RIP packets to receive. If you
specify none, then the router does not accept RIP packets from the specified IP
address on the specified interface. If you specify rip1, then the router accepts
RIPv1 packets. If you specify rip2, then the router accepts RIPv2 packets. If you
specify both, then the router accepts both RIPv1 and RIPv2 packets but only
keeps routes that conform to RIPv1. Routes conform to RIPv1 if they are
classful—for example, the network 172.16.x.x conforms as long as it uses a
Class B mask of 255.255.0.0. The router discards non-conforming routes. The
default is both.

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The demand parameter specifies whether the router uses RIP demand
procedures. This means that it:
■ only sends RIP updates when it has new routing information
■ does not time routes out
Specify yes if the connection to the neighbour is a dial-on-demand connection.
Configure both ends of the connection to have the same setting. The default is
no.

The authentication parameter specifies how the router authenticates RIP
packets. If you specify none, the router does not authenticate RIP packets. If
you specify password, the router uses a plaintext password authenticate RIP
packets. If you specify md5, the router uses an encrypted password. You must
specify none unless the router uses RIPv2. The default is none.

The password parameter specifies the password that the router uses if
authentication is password or md5. This parameter is required when
authentication is used. The password can be up to 63 characters long, but the
router only uses the first 16 characters.

The staticexport parameter specifies whether the router propagates static
routing information from this interface. If you specify yes, the router includes
static routes in routing exports. If you specify no, the router omits them. The
default is yes.

Examples To broadcast RIPv1 on an Ethernet interface (eth0), use the command:
add ip rip int=eth0

To send RIPv2 updates across a dial-on-demand interface (ppp0) with
password authentication, but not accept any RIP packets on the interface, use
the command:
add ip rip int=ppp0 sen=rip2 rec=no dem=yes au=pass
pass=hanselandgretel

To receive RIPv2 packets from only one host (172.16.248.33) on an Ethernet
interface (eth0), and broadcast RIPv1 packets on the interface, use the
commands:
add ip rip int=eth0 ip=172.16.248.33 rec=rip2 sen=no
add ip rip int=eth0 rec=no

Related Commands delete ip rip interface
set ip rip interface
show ip in Chapter 22, Internet Protocol (IP)
show ip rip

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25-10 add ip rip redistribute AR400 Series Router Software Reference

add ip rip redistribute

Syntax ADD IP RIP REDistribute PROTocol=BGP [LIMit=1..500]
[METric=0..16] [ROUTEMap=routemap] [SUBNET={ON|OFf|Yes|
No|True|False}]

where routemap is a character string from 1 to 15 characters long

Description This command enables the router to redistribute BGP routes as RIP routes.

The protocol parameter specifies the routing protocol from which RIP will
obtain the routes that it redistributes. Protocol must be set to BGP. You can also
redistribute statically-configured routes into RIP by using the staticexport
parameter of the add ip rip interface command on page 25-7.

The limit parameter specifies the maximum number of BGP routes that the
router can import into RIP. Importing too many routes into RIP reduces RIP’s
performance. The default limit is 50.

The metric parameter specifies the metric that RIP gives the imported routes,
unless you set the metric in the route map responsible for route filtering. If you
do not specify a metric with this parameter or the route map, RIP uses the
route’s original metric.

The routemap parameter specifies a route map. You can use the route map to
select routes for RIP to import, and to tag routes or change the route metric.
The route map must already exist. To create a route map, use the add ip
routemap command on page 28-49 of Chapter 28, Filtering IP Routes.

The subnet parameter specifies whether RIP can import subnet routes. This
parameter only applies if the router is configured to send RIPv2 packets. If you
specify no, RIP only imports classful network routes. If you specify yes, RIP
imports both classful and classless network routes. The default is yes.

Example To enable RIP to redistribute 50 BGP routes, which are selected by the route
map called bgp_to_rip, use the command:
add ip rip red prot=bgp routem=bgp_to_rip

Related Commands add ip rip interface
add ip routemap in Chapter 28, Filtering IP Routes
delete ip rip redistribute
set ip rip redistribute

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add ip trusted

Syntax ADD IP TRusted=ipadd

where ipadd is an IP address in dotted decimal notation

Description This command defines a trusted router. A trusted router is a source of RIP
broadcasts that you trust to provide up-to-date, valid routing information. If
you define trusted routers, the router only accepts routing information and
includes it in the routing table if it comes from a trusted router. A maximum of
32 trusted routers can be defined.

If you do not define trusted routers, the router accepts routing information
from any source, unless you have applied a route filter. See “Routing
Information Protocol (RIP)” on page 28-32 of Chapter 28, Filtering IP Routes.

The trusted parameter specifies the IP address of a device from which RIP
information is accepted. Adding one or more trusted routers automatically
enables the trusted router option.

Examples To specify the device with an IP address of 172.16.8.33 as a trusted source of
RIP information, use:
add ip tr=172.16.8.33

Related Commands delete ip trusted
show ip trusted

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25-12 delete ip rip interface AR400 Series Router Software Reference

delete ip rip interface

Syntax DELete IP RIP INTerface=interface [CIRCuit=miox-circuit]
[DLCi=dlci] [IP=ipadd]

where:
assumed.

Description This command deletes a RIP neighbour. The router stops exchanging routing
information with the RIP neighbour.

The interface parameter specifies the interface via which the router receives
RIP packets from the RIP neighbour. Valid interfaces are:

To see a list of currently available interfaces, use the show interface command
on page 9-68 of Chapter 9, Interfaces, or the show ip interface command on

The circuit parameter specifies the X.25 circuit on which to send or receive RIP
packets. It is a required parameter for X25T interfaces and is valid when the
interface is an X25T interface.

The dlci parameter specifies the Frame Relay DLC on which to send or receive
RIP packets. It is a required parameter for Frame Relay interfaces and is valid
when the interface is a Frame Relay interface.

The ip parameter specifies the IP address of the neighbour to delete.

Examples To delete a neighbour that is broadcasting RIP on an Ethernet interface (eth0),
use the command:
del ip rip int=eth0

To delete a neighbour that is sending to a specific IP address on a PPP interface,
use the command:
del ip rip int=ppp0 ip=172.16.248.33

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Routing Information Protocol (RIP) delete ip rip interface 25-13

show ip rip

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25-14 delete ip rip redistribute AR400 Series Router Software Reference


Syntax DELete IP RIP REDistribute PROTocol=BGP

Description This command stops RIP redistributing BGP routes, by deleting the
redistribution entry.

Example To stop RIP from importing BGP routes, use the command:
del ip rip red prot=bgp

Related Commands add ip rip redistribute

delete ip trusted

Syntax DELete IP TRusted=ipadd

where ipadd is an IP address in dotted decimal notation

Description This command deletes an entry from the trusted router table.

The trusted parameter specifies the IP address of a host from which RIP
information is no longer accepted. Deleting all trusted routers automatically
disables the trusted router option.

Examples To delete the host with an IP address of 172.16.8.33 as a trusted source of RIP
information, use:
del ip tr=172.16.8.33

Related Commands add ip trusted
show ip trusted

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Syntax SET IP RIP INTerface=interface [CIRCuit=miox-circuit]
[DLCi=dlci] [IP=ipadd] [NEXThop=ipadd] [SENd={NOne|
RIP1|RIP2|COmpatible}] [RECeive={NOne|RIP1|RIP2|BOth}]
[DEMand={False|NO|OFF|ON|True|YES}] [AUth={NOne|
PASSword|MD5}] [PASSword=password] [STATicexport={YES|
NO}]

where:
assumed.
■ password is a string 1 to 63 characters long. It may contain uppercase and
lowercase letters, digits (0-9), and the hyphen and underscore characters.

Description This command sets attributes of the RIP neighbour. The IP address and the
interface identify which RIP neighbour to change.

The interface parameter specifies an existing interface that the RIP neighbour
is on. Valid interfaces are:

To see a list of currently-available interfaces, use the show interface command
on page 9-68 of Chapter 9, Interfaces, or the show ip interface command on

The circuit parameter specifies the X.25 circuit on which the router sends or
receives RIP packets. It is a required parameter for X25T interfaces and is only
valid for X25T interfaces.

The dlci parameter specifies the Frame Relay DLCI on which to send or receive
RIP packets. It is a required parameter for Frame Relay interfaces and is only
valid for Frame Relay interfaces.

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25-16 set ip rip interface AR400 Series Router Software Reference

The ip parameter specifies the IP address of the RIP neighbour. The following
table shows the difference between specifying an address and not specifying an
address.

If you... The router accepts... And sends RIP updates to...
specify an address RIP packets from that that address.
by using ip address on this interface
do not specify ip all RIP packets on this • the RIP multicast address
interface 224.0.0.9 if the send parameter is
rip2 or compatible.
• the broadcast address if the send
parameter is rip1.

The nexthop parameter specifies the IP address of the best next hop to the
destination. In most configurations, the router is the best next hop when it is
the originator of the RIP update. In that case, specify nexthop=0.0.0.0.
However, in some configurations, the best route to the destination is out
another router. In that case, specify the IP address of that router as the next
hop. This stops RIP neighbours from unnecessarily sending packets via the
router. See Appendix A of RFC 1723 for an example in which part of a network
uses RIP and part uses another routing protocol such as OSPF. The nexthop
parameter is only valid when you specify ip and when send is rip2 or
compatible. The default next hop is 0.0.0.0.

The send parameter specifies the version of RIP packet to send. If you specify
none, then the router does not send RIP packets. If you specify rip1, then the
router sends RIPv1 packets. If you specify rip2, then the router sends RIPv2
packets. If you specify compatible, then the router sends RIPv2 packets that
are compatible with routers that only receive RIPv1 packets. It achieves
compatibility by excluding routes that such routers treat as host routes. The
default is rip1.

The receive parameter specifies the version of RIP packets to receive. If you
specify none, then the router does not accept RIP packets from the specified IP
address on the specified interface. If you specify rip1, then the router accepts
RIPv1 packets. If you specify rip2, then the router accepts RIPv2 packets. If you
specify both, then the router accepts both RIPv1 and RIPv2 packets but only
keeps routes that conform to RIPv1. Routes conform to RIPv1 if they are
classful—for example, the network 172.16.x.x conforms as long as it uses a
Class B mask of 255.255.0.0. The router discards non-conforming routes. The
default is both.

The demand parameter specifies whether the router uses RIP demand
procedures. This means that it:
■ only sends RIP updates when it has new routing information
■ does not time routes out
Specify yes if the connection to the neighbour is a dial-on-demand connection.
Configure both ends of the connection to have the same setting. The default is
no.

The authentication parameter specifies how the router authenticates RIP
packets. If you specify none, the router does not authenticate RIP packets. If
you specify password, the router uses a plaintext password authenticate RIP
packets. If you specify md5, the router uses an encrypted password. You must
specify none unless the router uses RIPv2. The default is none.

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The password parameter specifies the password that the router uses if
authentication is password or md5. This parameter is required when
authentication is used. The password can be up to 63 characters long, but the
router only uses the first 16 characters.

The staticexport parameter specifies whether the router propagates static
routing information from this interface. If you specify yes, the router includes
static routes in routing exports. If you specify no, the router omits them. The
default is yes.

Examples To change the password for a RIP neighbour using authentication, use the
command:
set ip rip int=ppp0 ip=172.16.248.33 pass=supersecret

To change a RIP neighbour so that it uses RIPv2 instead of RIPv1, use the
command:
set ip rip int=vlan2 ip=172.16.248.33 sen=rip2 rec=rip2

set ip riptimer
show ip rip

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25-18 set ip rip redistribute AR400 Series Router Software Reference


Syntax SET IP RIP REDistribute PROTocol=BGP [LIMit=1..500]
[METric=0..16] [ROUTEMap=[routemap]] [SUBNET={ON|OFf|
Yes|No|True|False}]

where routemap is a character string from 1 to 15 characters long

Description This command changes the settings the router uses when it redistributes BGP
routes as RIP routes.

The protocol parameter specifies the routing protocol from which RIP will
obtain the routes that it redistributes. Protocol must be set to BGP. You can also
redistribute statically-configured routes into RIP by using the staticexport
parameter of the add ip rip interface command on page 25-7.

The limit parameter specifies the maximum number of BGP routes that the
router can import into RIP. Importing too many routes into RIP reduces RIP’s
performance. The default limit is 50.

The metric parameter specifies the metric that RIP gives the imported routes,
unless you set the metric in the route map responsible for route filtering. If you
do not specify a metric with this parameter or the route map, RIP uses the
route’s original metric.

The routemap parameter specifies a route map. You can use the route map to
select routes for RIP to import, and to tag routes or change the route metric.
The route map must already exist. To create a route map, use the add ip
routemap command on page 28-49 of Chapter 28, Filtering IP Routes. To stop
using a route map, specify routemap= without specifying a route map name.

The subnet parameter specifies whether RIP can import subnet routes. This
parameter only applies if the router is configured to send RIPv2 packets. If you
specify off, RIP only imports classful network routes. If you specify on, RIP
imports classless network routes. The default is on.

Example To change the number of routes that RIP imports to 200, use the command:
set ip rip red prot=bgp lim=200

add ip rip redistribute
add ip routemap in Chapter 28, Filtering IP Routes

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Routing Information Protocol (RIP) set ip riptimer 25-19

set ip riptimer

Syntax SET IP RIPTimer [FLush=1..4294967295]
[HOlddown=1..4294967295] [INvalid=1..4294967295]
[UPdate=1..4294967295]

Description This command sets the values of the global RIP timers in seconds. This
command does not change flush, holddown, or invalid time intervals for
existing IP RIP routes. Existing routes continue to be invalidated by time
intervals previously set.

The update parameter sets the time between RIP updates for all interfaces not
using RIP on demand. The default is 30 seconds.

The invalid parameter sets the time after which the router deems a route to be
invalid because no update has been received. The default is 180 seconds.

The holddown parameter sets the time after a route has become invalid during
which the router ignores updates for the route that would normally make the
route valid again. The default is 120 seconds.

The flush parameter sets the time for when the route is last updated until it is
flushed from the route table. This time must equal or exceed the sum of the
invalid and holddown times. The default is 300 seconds.

After a valid update, the flush and invalid timers are restarted. When the
invalid timer expires, the route is invalidated and the holddown timer started.
The flush timer continues to run. When the holddown timer expires, valid
updates for the route result in the router being reinstated. When the flush
timer expires, the route is deleted from the route table.

Examples To force RIP routes to be invalidated and flushed as soon as a single update is
missed, use the command:
set ip ript in=35 ho=0 fl=35

Related Commands set ip rip interface
show ip rip
show ip riptimer

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25-20 show ip rip AR400 Series Router Software Reference

show ip rip

Syntax SHow IP RIP [INTerface=interface] [CIRCuit=miox-circuit]

where:
interface number in the range. If a logical interface is not specified, 0 is
assumed.

Description This command displays information about the RIP configuration for IP
(Figure 25-4,Figure 25-5 on page 25-21, and Table 25-1). The interface, circuit,
dlci and ip parameters can be used to restrict the display to RIP neighbours on
specific interfaces, MIOX circuits, Frame Relay DLCs or with specific IP
addresses. Valid interfaces are:

Figure 25-4: Example output from the show ip rip command

Interface IP Address Send Receive Demand Static NextHop Auth
Password
----------------------------------------------------------------------------------
eth0 - COMP BOTH NO YES - NO
NO
vlan1 172.16.249.34 RIP1 RIP2 YES NO - PASS
********
vlan2 172.16.250.2 RIP2 NONE YES YES - PASS
NOT SET
----------------------------------------------------------------------------------

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Routing Information Protocol (RIP) show ip rip 25-21

Figure 25-5: Example output from the show ip rip command (X.25, Frame Relay interface)

Interface Circuit/DLCI IP Address Send Receive Dmd Stc Nexthop
Auth Password
----------------------------------------------------------------------------------
eth0 - - COMP BOTH YES NO -
NO NO
ppp0 - 172.16.249.34 RIP1 RIP2 NO YES -
PASS ********
ppp1 - 172.16.250.2 - RIP2 NONE YES -
PASS NOT SET
----------------------------------------------------------------------------------

Table 25-1: Parameters in output of the show ip rip command

Parameter Meaning
Interface Interface over which RIP packets are exchanged with the RIP
neighbour. When multihoming is enabled (two or more
logical interfaces have been assigned to a single Layer 2
interface), all interface names include a hyphen and the
logical interface number.
Circuit/DLCI Circuit name or DLCI number if this is an X.25 or Frame
Relay interface.
IP Address IP address of the RIP neighbour.
Send Whether the type of RIP packets is none, RIP1, RIP2, or
comp.
Receive Whether to receive RIP1, RIP2, or both types of RIP packets,
or none.
Dmd (demand) Whether to use the demand RIP procedures.
Stc (static) Whether static routes are exported.
NextHop IP address destination of the RIP update of the next hop
back to the configured device. Valid when using RIPv2.
Auth Whether to use a password, MD5, or no authentication
with the RIP neighbour.
Password Whether a password is set.

Examples To show the RIP configuration for the eth0 interface, use the command:
sh ip rip int=eth0


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25-22 show ip rip counter AR400 Series Router Software Reference

show ip rip counter

Syntax SHow IP RIP COUnter[={Detail|Summary}]
[INTerface=interface] [CIRCuit=miox-circuit]

where:
assumed.

Description This command displays counters for RIP (Figure 25-6, Table 25-2).

The counter parameter specifies whether to display summary or detailed
information. If detail is specified, counters for each RIP neighbour and total
counts for all RIP neighbours are displayed. Otherwise, the total counts for all
RIP neighbours are displayed.

The interface, circuit, dlci and ip parameters restrict the display to RIP
neighbours on specific interfaces, MIOX circuits, Frame Relay DLCs or with
specific IP addresses. Valid interfaces are:

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Routing Information Protocol (RIP) show ip rip counter 25-23

Figure 25-6: Example output from the show ip rip counter=detail command

IP RIP Counters:
Interface: eth0
Input: Output:
inResponses ...... 2568 outResponses ..... 2567
inTrigRequests ...... 0 outTrigRequests ..... 0
inTrigResponses ..... 0 outTrigResponses .... 0
inTrigAcks .......... 0 outTrigAcks ......... 0
inDiscards .......... 0

Interface: fr0 Dlci: 9 IP Address: 172.16.249.34
Input: Output:
inResponses ..... 2567 outResponses ...... 2567
inTrigRequests .... 0 outTrigRequests ...... 0
inTrigResponses .... 0 outTrigResponses ..... 0
inTrigAcks ......... 0 outTrigAcks .......... 0
inDiscards ......... 0

IP RIP Counter Summary:
Input: Output:
inResponses ..... 5135 outResponses ...... 5134
inTrigRequests ..... 0 outTrigRequests ...... 0
inTrigResponses .... 0 outTrigResponses ..... 0
inTrigAcks ......... 0 outTrigAcks .......... 0
inDiscards ......... 0

Table 25-2: Parameters in output of the show ip rip counter command

Parameter Meaning
Interface Interface of the RIP neighbour. When multihoming is
enabled (two or more logical interfaces have been assigned
to a single Layer 2 interface), all interface names include a
hyphen and the logical interface number.
Circuit Circuit name if this is an X.25 interface.
DLCI DLCI number if this is a Frame Relay interface.
IP Address IP address of the RIP neighbour.
inResponses Number of response packets received.
inTrigRequests Number of triggered request packets received.
inTrigResponses Number of triggered response packets received.
inTrigAcks Number of triggered acknowledge packets received.
inDiscards Number of packets discarded. Packets may be discarded
due to authentication failure, packets received when
receive is disabled, or mismatched sequence number of a
triggered acknowledgement.
outResponses Number of response packets transmitted.
outTrigRequests Number of triggered request packets transmitted.
outTrigResponses Number of triggered response packets transmitted.
outTrigAcks Number of triggered acknowledge packets transmitted.

Related Commands show ip counter in Chapter 22, Internet Protocol (IP)
show ip rip

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25-24 show ip rip redistribute AR400 Series Router Software Reference


Syntax SHow IP RIP REDistribute

Description This command displays information about importing routes from BGP into RIP
(Figure 25-7, Table 25-3).

Figure 25-7: Example output from the show ip rip redistribute command

RIP Route Redistribute

Protocol RouteMap Subnet Metric Redistribute/Limit
-----------------------------------------------------------
BGP bgp_to_rip Yes 10 68/100
-----------------------------------------------------------

Table 25-3: Parameters in output of the show ip rip redistribute command

Parameter Meaning
Protocol The routing protocol that the redistributed routes come
from: BGP.
RouteMap The name of the route map that selects routes for RIP to
import, and/or changes the route metric.
Subnet Whether RIP can import subnet routes; either No (RIP only
imports classful network routes) or Yes (RIP imports classless
and classful network routes).
Metric The metric that RIP gives the imported routes, or “-” if the
metric is not changed when redistributing. A metric set by
the route map overrides this setting.
Redistribute The number of routes that RIP has redistributed.
Limit The maximum number of routes that RIP can redistribute.

Examples To display the number of BGP routes that RIP has redistributed, use the
command:
sh ip rip red

Related Commands add ip rip redistribute
show ip routemap in Chapter 28, Filtering IP Routes

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Routing Information Protocol (RIP) show ip riptimer 25-25

show ip riptimer

Syntax SHow IP RIPTimer

Description This command displays the current settings of the global RIP timers
(Figure 25-8, Table 25-4).

Figure 25-8: Example output from the show ip riptimer command

IP RIP timers
Timer name Default Current
------------------------------------
Update 30 5
Invalid 180 15
Holddown 120 60
Flush 300 75
------------------------------------

Table 25-4: Parameters in the output of the show ip riptimer command

Parameter Meaning
Timer name Timer name.
Default Default in seconds for the timer.
Current Current value in seconds for the timer.
Update Time in seconds between RIP updates for all interfaces not
using RIP on demand.
Invalid Time in seconds after which the router deems a route to be
invalid when no update has been received for the route.
Holddown Time in seconds after a route has become invalid during
which the router ignores updates for the route that would
normally make the route valid again.
Flush Time in seconds from the last update of a route until the
route is flushed from the route table.

Examples To display the current settings of the global RIP timers, use the command:
sh ip ript

Related Commands set ip riptimer

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25-26 show ip trusted AR400 Series Router Software Reference

show ip trusted

Syntax SHow IP TRusted

Description This command displays the contents of the trusted router table and the state of
the enable flag (Figure 25-9). The trusted router table ensures that the router’s
routing table is updated only by trusted sources of routing information. Other
routers are not filtered but their routing information is not used until they are
added to the table.

Figure 25-9: Example output from the show ip trusted command

Host address
------------------
172.16.8.33
------------------

Related Commands add ip trusted
delete ip trusted

C613-03117-00 REV A

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